Impact of some Deacidification Means on the Changes of Selected Properties of Pulp

Abstract

Deacidification is one of the basic restoration techniques to protect archival records stored in various depositories. This study examines the influence of selected deacidification aids on lignocellulose materials. Samples represent the commonly used pulps in the paper industry. These materials were treated with three deacidification methods in cooperation with National Archive in Prague. We monitored for changes as the optical, mechanical and chemical properties and changes on hypermolecular level. The results showed that the selected deacidification methods affect the surface-molecular and structural properties. The optical properties of the samples didn´t show any decrease of the ISO brightness and the colour coordinates L*a*b*. The values of surface pH were increased as expected. The mechanical properties of the samples was characterised by unitary stiffness, it was observed a significant sample stiffness decrease after treatment with the Bookkeeper and HERCO deacidification methods.

Archival performance of paper as affected by chemical components: A Review

“…This was similarly attributed to the presence of calcium carbonate (Williams and Grosjean 1992). Further study of the effects of nitrogen oxides on the chemical structures and surface properties of stored air-dry cellulose pulp were reported by Milichovský et al (2007) and Hajek et al (2016). Dust, as another source of pollutants (being comprise of organic aerosols, elemental carbon, crystal elements, and ammonium, sulfate, and nitrite ions), had been shown to be a contributing factor in the decrease of degree of polymerization of pure cellulosic paper (Bartl et al 2016).…”